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How to test compatibility with Excel Online?

I'm getting the "Unsupported Features There are some features in your workbook that we can't show in the browser" message suddenly when trying to open our file in Excel Online.... Nobody has added any of those features to the file, and I can't seem to figure out how to check any of those compatibility issues :( Our whole project is locked up until we can solve this... Please advise ASAP

I found that there were some notes or inking somewhere in the workbook that were preventing Excel Online.... It took quite a bit of digging though. It would be great to have some way to see and remove any compatibility issues with Excel Online